Usually, most of the TDB files are stored in the lock directory. Since Samba 3.4.0, it is possible to differentiate between TDB files with persistent data and TDB files with non-persistent data using the state directory and the cache directory options.
This option specifies the directory where TDB files containing important persistent data will be stored.
|Registry Path||Software\Policies\Samba\smb_conf\state directory|
|Value Name||state directory|